The Reach has 451 wheels so for big tyres you are limited... but due to full suspension, that's not necessary anyway. SWMBO has Intense Micro Knobby tyres, they are excellent. There are other off-road choices as well such as Kenda Small Block 8. The racing BMX crowd uses 451.

Mr Mulleady, there is a simple and economic solution to you bike check in / travel issues; select which of your stable you are most attached to, sell the rest, and buy your own plane with the proceeds - no more nasty flight attendants / ground staff to give you gyp !!